Electric water-heater.



1L (3. LEVY & G. N. BLANOHARD.

ELECTRIC WATER HEATER. ,.PPLI0ATI01 FILED MAR. 29, 1909.

Patented Nov. 9

l UNIT D sTATns r trENT ornon.

HENRI G. LEVY AND GEORGE BLANCHARD, OF SAN FRANCI BLANCHARD ASSIGNQR T0 SAID LEVY.

s00, CALIFORNIA; s41!) ELECTRIC WATER-HEATER.

To all whom 'i-t'may concern:

lie. it known that we, HENRI G. LEVY and (licence N. Biianonium, citizens of ehe Unit ed States, residing in the city Han Francisco and State of California, have invented new and useful Improvements in Electric \vater-lleaters, of which the follovving is a specification.

Uur invention relates to electrical heating appliances, and pertains especially to \\'alcr-heatcr For use by dentists and others. 'lts object is to provide a simple, neat, coinpact, practical'wa.tei.'=lieater of few parts, occupying a. smallamouut (if-space, and in which the vheating element is so arranged that provision made for the e-Xpansion'and contraction of this heating element without. any loss oi heat, or disarrangement of parts due to expansion and contractitm; and to insure the best possible contact for the rapid transmission oi. heat from the heating element. oi the body oi" the fluid tobe heated. and at the same time a t'l'ort'ling' means to prevent the over-lieating or burning out of the heating; element. It also provides a device which will have means for facilitating the quick heating of a small quantity of water in a coniparatively large vessel, and main; taining the more l'lighly. heated partof the and county of v water separate: from the rest so that a continuous supply of hot water may be drawn. The invention consists of the parts, and the construction and combination of. parts. as hereinafter more fully described and claimed, having reference to the accompanying drawings, in which Figure '1 is a vertical section. Fig. 2 isa plan view partly broken away, of. the heating element. Fig. 3 is a section of same. in the practical embodimentoi the invention we el nploy afllieating, element, represented more particularly in Figs. 2 and l. 'lhis heating element comprises essentially a heating coil A, wound in theforni of a. flat, spiral, and with'the varimisturns of the co suitably 'insulatedtrom each other by no propriate means. as an asbestos string 2.

'lhiscoil is laid between twoshects ot' mica"- for the transmission of heat from the coil to the vessel to which the heating element is applied. These backing insulating sheets 3,

and at the top of -1neans, as the gland ring 10.

' drawn. g

In practice, the parts being assembled in 105 Specification of Letters Patent. Patented N 0v..9, 1909. Application filed March 29, 1909. Serial No. 486,600.

strip 2, are suitably secured or held together by a suitable bonding material, as shellac, and the terminals 5--6 of the coil are brought out through suitable perforations in one of the insulating sheets 3.

The heating coil A may be wound to obtain various peripheral shapes; theessential feature however being that the coil lies in ahorizontal plane, and With its insulation constitutes a thin thickness of this element varying of course with the size of the heating ire employed: An element suitable for heating vessels eontaining from one to two gallons of water would not ordinarily be 0nd of an inch in thickness.

,In- Fig. l, We have shown a convenient nd'ithod of applying a heating 61611163111, for water-heater, in which *7 represents a base casting inclosing which casting is detachglass bowl. or reservoir 9, the lied to the castin r by suitable is tight joint ably secured a.

bowl being sec! is made by means of a rubber 'llhe under side of the bottom of the casting 7 is carefully machined to provide a smooth, flat surface and chamber suitable to. receive the heating element represented by the coil." backings 3. Against A, and its insulating v the under side of the element is placed a layer of asbestos 12, or other suitable insulating material, and against. the layer is placed a metal plate 13, and the parts are all'held to the casting by suitablegmeans The terminal Wires 5 and 6 of the coil are i brought out through the insulation 12 andplate 13, and. connected to binding-posts 15- to which the line ,wires 16 are attached.

and an internal flange 18, carefully maclunetl,

conical valvepartition 19; this valve 19 hav- I ingan opening 20at its apex, for a down-" Water above-@100 with the intervening coil A and'insulatingf55 a hot water chamber '8, 75

The receptacle 7 has adraw oft cook 17,

onwhich loosely rests an inverted 7 her, from which the hot water is first withthe manner described and shown, and the heater filled with water, a current is t-ur'nedu' on and the heat from the coil radiate fiat sheet-like device; the 65' gasket 11. 80.

as the hot water reaches the boiling through. the thin upper'mica partitions 13,

and tie metal bottom of the receptacle 7- to heatthe latter and heat the-water in the hot water chamber 8. When the bottom of the receptacle becomes hosted, the hot Water rises to the top of chamber 8, and starts a circulation within said chamber. As soon both the steam and hot water rise into'the reservoir 9 and around the peripheral sup porting flange of the valve 1.9, the latter.

resting loose on the flange 18 Almost as soon as'the heat is turned on, hot water may be, withdrawn from the cook 17.- As soon as the hot water is drawn oil from the chamber 8'tl1rough the 0001(17, or circulates upward into the reservoir 9, a downward current of cold water I opening in the apex. of the inverted conical partition andv replenishes the water so displaced in theheating chamber 8. Thus it is seen, that. the part 19 performs the double function of a partition to inclose the hot water and separate it from the cold, and of a self-seating safety valve allowing for the escape of hot water and steam, when necesmerged, and expansion sary, from the chamber 8. No part of the heating coil or the heating element subthe coil may take the bottom. of the ing any air gap therewith, or otherwise interfering with the transmission of the heat to the contained liquid. Also the parts are easily dismantled, so that the interior of the place in a plane parallel to 3 reservoir -in the interior of the receptacle can be easily cleaned, there being no narrow water passages in which dirt can collect. Having thus described our invention, what we claim and desire tosecure by Letters Patent is-- I 1'. A heating unit' comprising two sheets of insulated materialthe opposed surfaces of which are normally coated with a binder which will become active on the application. of heat thereto; and a Winding of baremetah and insulating material between the sheets forming a fiat insulated coil, said winding being'united to the sheets to bind the several parts and thereby form a substantially rigid heating element. m

A heating unit comprisingxtwo opposed sheets of mica having their adjacent surfaces coated with a substance which fuses on the applicationj'of heat thereto,.'and a iiatcoil between said sheets and in contact there with, said coil being formedof alternate windings ofbare wire and asbestos twine," and said coating serving as binder for uniting the sheets. to each, other and to said coil. a

3. A heating unit coni ugisii'ig two sheets of insulating material and an interposed fiat coil composed of a winding of bare wire and "ii'ltermediate' asbestos twine, and a shelpoint,

passes through the ta cc of the receptacle, a plate forming a base I support .for 'for securingand contraction of receptacle 7 Without form- 1 annula'r fiange above its said reservoir, and contiguous bottom having a recess,

'. I p season lac coating on the inner surfaces of'- the sheets for uniting the sheets and windingjto each other when heat-is applied thereto.

4:. The combination with-a watcr fcontain ing receptacle prgwidedwith.a"flat-faced" under surface, ofa' heating unit compris ing two sheets opposed surfaces of which are normally coated with a"'binder which willbecome activeon theapplication of heat thereto,- and a winding of bare fnetaland insulatingof insulating material, the

mater'a'l between the sheets forming a flat insulated c'oil, said Winding being united to the'sheets to combine the several arts and thereby form a substantially rigi heating element, the terminals of the wire extending outward from betweenthe sheets, one of said sheets lying against the said fiat-faced surthe other sheet, andfastenings the base supportand interme j diate heating'element.

5. A 'water-lieater-consisting of a reser-l; voir, with a flat bottom, and one side of said flat bottom having a recess, a heatin' coil in said recess, anda loose fitting conlca-lly inverted valve in the reservoir, the valve open and contiguous m the reservoir.

the apex of. Y to said bot- I tom, said valve forming acomcal partition;-

A y M 6. In a-water-heater, the coniblnat on oi a reservoir and aninverted. conical valve and partition in saidt'reservoiiy saidvalve having its apex"openlandnrranged contiguoils to the bottom of said reserv oir, [and means for heating the latter.

7- Inawater-heater, the combination of a'reservoir, and an inverted conical valve,

and partition insaid' reservoir, said valve having its apex open and arranged contigu cos-to the bottom of said I reservoir, and

means for heating the latter, said reservoir having fa draw-off -coc k tapping the space on the under side of said partition.

In an electrical wa'tenheater, a reser voir having a fiat bottom, andjaninternal bottom, and'a. con ical inverted partition and annular base flange resting bn the Iflange in the apexof said valve :open to the bottom of the reservoir, means for-heating the"lat-tei- ,fland a cocktapping the space on'the'under'side of said partition. 4

9. A water-heatercomprising a'reservoir having a flat bottom, the nndersicle'of said the bottomof said recess forming also the bottdmofthe reservoir, -a fiat coil of a naked Wire in said recess andyspaced sheets-of mica inclosing. the coil" whereby the latter isinsulated from" the insulation on the outside of said valve having an 1 I coil, me HIS for holding the latter to the bot- 1 tom, and the. terminals of said coil} extending out underneath said insulation;

t tending oi t underneath said insulation, and

. ape of said partition open and contiguous to the bottom of the resel'i oirQand a cock 10. A water-heater comprising a reservoir tapping this space on the under side of said having a flat bottom, the under sideof said bottom havi'nga recess, the bottom offsaid' partitlon. recess forming also the bottom of the reser- In testimony whereof e have hereunto 5 voir, a flat coil in said recess and insulated set our hands in presenceflif two subscribing from thebottomjinsulation :on the outside witnesses. i

' of said coil, means for holding the latterto U r r the Hottom, the terminals of said coil ex HE) 10 a loose fitting inverted hollow, conical par it-messes:

tition supported in the reservoir, \viththc lnnunns A. lnNr nnn,

F. E. NIAYNARD; 

